I have my own self-hosted Matomo instance [1]. Via Docker & docker-compose it's quite easy to install and keep up to date and Matomo is open source, well maintained, very well behaved and pretty hands off. And I configured it on my websites with cookies turned off [2] and with IP anonymization [3]. In such an instance you don't need consent, or even a cookie banner, because you're not dropping cookies, or collecting…
> And I disagree with another commenter here saying Analytics is just for vanity. That's not true — even for a personal blog analytics are useful to see which articles are still being visited and thus need to be kept up to date, or in case content is deprecated, the least you could do is to put up a warning. Some examples: I maintained a Vim ChangeLog for a while (which is quite some work), and turned out no one was…
My wife as several e-commerce and our weekly "walking through the matomo screens over a glass of wine" has learned us that there are important niches. And what those niches are (vegan smartphone covers, Fairphone flip-cases, fairtrade and environmental-friendly mouthmasks).
Sure, you also need customer interviews and old-fashioned market-research, but your webapp and website is telling you a lot about your users.
And sure, often, you don't need any metrics. But just like Carpetsmoker above, I see a lot of value in metrics. Just don't fall in the trap to collect "you-never-know" metrics: that is privacy-invading, a liability and requires a scale beyond anything you really need. You don't need data-lake, distributed ETL processes and whatnot to find out that there are products in your webshop selling better than others because you are doing well on natural searches for that product.